Apparatus having a movable portion and a fixed portion for reproducing data from an optical disk by a light beam

Abstract

An apparatus for reproducing data from an optical disk by a light beam includes a housing which is movable in the readial direction of the optical disk. The housing includes a directing element for directing the light beam onto the optical disk, a detector for detecting the light beam from the optical disk so as to generate an electrical signal corresponding to the detected light beam, a dividing element for dividing the electrical signal generated by the detector into a low frequency component and a high frequency component, and an amplifier for amplifying the high frequency component divided by the dividing element. The reproducing apparatus further includes a moving element for moving the housing in radial direction of the optical disk, an adjuster for adjusting a distance of the directing element with respect to the optical disk in response to the low frequency component divided by the dividing element, and a reproducing circuit for reproducing data from the optical disk in response to the amplifier.

I claim: 
     
       1. An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk,   means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam,   means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and   means for amplifying the high frequency component;   means for moving the housing in the radial direction of the optical disk;   means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and   means, responsive to the amplifying means, for outputting the stored data from the optical disk.     
     
     
       2. A reproducing apparatus according to claim 1, wherein the detecting means includes a plurality of photoelectric converters for photoelectric-converting the detected light beam. 
     
     
       3. A reproducing apparatus according to claim 1, wherein the dividing means comprises a filter circuit means for dividing the electrical signal into the low frequency component and the high frequency component. 
     
     
       4. A reproducing apparatus according to claim 3, wherein the filter circuit means includes a resistor and a capacitor for determining a band dividing frequency of the filter circuit means. 
     
     
       5. A reproducing apparatus according to claim 1, wherein the amplifying means comprises an operational amplifier for amplifying the high frequency component divided by the dividing means. 
     
     
       6. A reproducing apparatus according to claim 1, wherein the amplifying means comprises a current-voltage converter for converting the high frequency component divided by the dividing means. 
     
     
       7. An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having   means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk,   means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam,   means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and   first amplifying means for amplifying the high frequency component;   second amplifying means, disposed on the fixed portion of the apparatus, for amplifying the low frequency component and for supplying the amplified low frequency component to the first amplifying means;   means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and   means, responsive to the first amplifying means, for outputting the stored data from the optical disk.   
     
     
       8. A reproducing apparatus according to claim 7, wherein the detecting means includes a plurality of photoelectric converters for photoelectric-converting the detected light beam. 
     
     
       9. A reproducing apparatus according to claim 7, wherein the dividing means comprises a filter circuit means for dividing the electrical signal into the low frequency component and the high frequency component. 
     
     
       10. A reproducing apparatus according to claim 9, wherein the filter circuit means includes a resistor and a capacitor for determining a band dividing frequency of the filter circuit means. 
     
     
       11. A reproducing apparatus according to claim 7, wherein the first amplifying means comprises an operational amplifier for amplifying the high frequency component divided by the dividing means. 
     
     
       12. A reproducing apparatus according to claim 7, wherein the first amplifying means comprises a current-voltage converter for converting the high frequency component divided by the dividing means. 
     
     
       13. An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk,   means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam,   means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and   first amplifying means for amplifying the high frequency component;   means for moving the housing in the radial direction of the optical disk;   second amplifying means, disposed on the fixed portion of the apparatus, for amplifying the low frequency component and for supplying the amplified low frequency component to the first amplifying means;   means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and   means, responsive to the first amplifying means, for outputting the stored data from the optical disk.